10 UYPERIID.E. 



AMPHIPODA. HYPERIID^. 



HYP ERIN A. 



Genus HYPERIA. (Latreilk.) 



Hyperia. LATREILLE, in DESMAREST'S Consid. sur Crust, p. 258, 1825. 



MILNE EDWARDS, Ann. des Sci. Nat. xx. p. 387. Hist, des 



Crust, t. iii. p. 74. DANA, U. S. Explor. Exped. p. 986. 



SPENCE BATE, Cat. Amph. Brit. Mus. p. 292. 

 Metoechus. KROYER, Gronl. Amfip. p. 60. MILNE EDWARDS, Hist, des 



Crust, iii. p. 78. 



Tauria. DANA, U. S. Explor. Exped. p. 988. 

 Hiella. STRAUSS, Mem. du Museum t. xviii. 



Generic character. Cephalon large, orbicular. Eyes large, 

 occupying most of the lateral, and encroaching upon the frontal, 

 walls of the head. Antennae short, subequal. Gnathopoda 

 nearly alike, small ; first pair nearly simple, the second complexly 

 subchelate. Pereiopoda subequal. Three posterior pairs of 

 pleopoda biramose. Telson squamiform. 



THE head is large and rounded. The body is broad 

 and convex. The eyes occupy the greater portion of 

 the lateral and dorsal walls, and encroach upon the 

 frontal surface of the head. The antennas are short, 

 being never longer than the depth of the head, and nearly 

 equal in length. The lower pair are inserted at a consi- 

 derable distance from the upper. The arms are small 

 and imperfectly prehensile, but formed upon the com- 

 plex type so generally prevailing in this division of 

 Amphipoda. The walking legs are nearly of similar 

 length, and tolerably strong. The caudal appendages 

 are biramose, and the middle piece consists of a small 

 lanceolate scale. 



Dana has, we think correctly, associated the genus 

 METOECHUS of Krb'yer with the present, from which it 



